Apparatus for applying lining material to covers



1927. v 1,623,529 Apnl 5 B. DEWEY ET AL APPARATU FOR APPLYING LINING MATERIAL TO COVERS Filed Feb. 17 1925 2 Sheets-Sheet '1 v fn'z/eni'ors flrad Z e y flewey I/zeodoref/fz'l Z er Patented Apr. 5, 1927.

- UNITED STATES 1,623,529 r. OFFICE.

A ff BRADLEY DEWEY, OF CAMBRIDGE, MASSACHUSETTS, AND THEODORE T. MILLER, OF

ORANGE, NEW JERSEY, ASSIGNORS T0 DEWEY & ALMY CHEMICAL COMPANY, OF CAMBRIDGE, MASSACHUSETTS, A COBIPOBATION OF MASSACHUSETTS. v

APPARATUS FOR APPLYING LINING TERIAL T0 COVERS.

Applioation'filed February 17, 1925. Serial No. 9,826.

This invention relates to a 'method for controlling the distribution of a liquid on a roll, particularly upon the roll of an apparatus ,for applying liquid lining material to covers for cans, jars and the like and particularly to apparatus of the type shown:

and described in the patent to 'laliaterro, No. 1,299,259, granted April 1, 1919..

In the apparatus shown and described in the said patent two rolls are employed, each rotating in the same direction at substantially the same peripheral velocity and each dipping into a loath of liquid lining material. For scraping the surtace or one of the rolls to prevent an overabundant or ex cessive amount of the material on the sec= -ond roll a knife-edge scraper is spaced a measured distance from the first roll. Thus the roll adjacent the scraper functions as'a regulating roll for regulating or controlling the amount oil material applied to the other roll which serves as an applying roll for applying the material to can covers which are rolled prpgressivelyalong the longitudinal surface of this roll with a portion of their periphery in contact therewith, the lining material thus flowing or being scraped on to the covers.

Although the above apparatus may lune tion in an eficient manner when usin as a lining material a rubber compound dissolved in benzol, nevertheless it. is not at all suitable for some other lining compounds lating roll the moreparticularly lining compounds made with rubber latex or other emulsions.

It has been found that when lining ma terials of such character are used" a knifeedge scraper as shown in the said patent or a scraper similar thereto revolving with the surface of the applying roll is ineficient and even a roll scraper with its surf is inadequate and inefficient because of the tendency of some oithe rubber in alater to coagulate wherever rubbing friction is encountered. As a result of such coagulation sticking to the scraper or to the regucoating on the applying roll is not smooth and of uniform thichiess but is uneven and irregular so that the covers usually fail to receive a proper amount of the lining material.- To maintain a if'rm coating on the applg roll under such conditions it has been found necessary to clean the scraper or regulating roll at a in in which:

frequent intervals, therebyconsuming considerable time and labor.

()bjects of this invention are to overcome the difficulties inherent in the above apparatus and-to provide an eflicient apparatus for distributing an even film of compound over the surface of an applying roll in the manner hereinafter described.

In accordance with this invention the applying roll dips into. a bath of liquid com-- pound but the routing roll is preferably positioned above the bath and in close juxtaposition to the applying roll, the two rolls heing suitably spaced from each other at their meeting surfaces. Both rolls may be driven in the same rotational direction, prelierably the applying roll being driven at a considerably greater peripheral velocity than the regulating roll. By properly choosing the relative speeds of the two rolls and spacing them from each other an appropriate distance there maybe maintained on the applying roll a coating substantially uniform throu hout. No attempt is made to remove the liningmaterial from the rogu latin roll and in operation this roll may he ewiee coated with a small portion of ill till

the lining material stripped from the distributing roll although an overabundant amount of the material on the distributing roll is forced or directed back into the-bath as will hereinafter be described.

The invention is illustrated in-one of its preferred forms in the accompanying drawig. l is a side elevation of an apparatus tor applying liquid lining material to can covers;

Fig.2 is a section on the line 22 of Fig. l;

- Fig. 3 is an elevation of one end of the apparatus viewed from the right of Fig.

Fig. i is a diagrammatic view showing the principle of the operation of. the rolls; and

Fig. 5 is a view of an auxiliary feature.

llhe preferred embodiment of the invention illustrated comprises a flat table or support 1 supported in horizontal position above the ground bylegs 2 and suitably supported upon the table 1 is an elongated rectangular gnu 3 containing llqlld lining material.

upported at its ends y brackets t and arto dip into the bath or the liquid lining m terial in the pan 3 is a rotating applying roll 5, the lining material adhering to the roll as it dips into the bath thereby formin a coating over its entire length. Extending parallel to and having its axis in substantially the same horizontal plane as that of the applying roll is a small or regulating roll 6 suitably spaced from the applying roll. For the particular purpose of applying lining material to can covers the space between the two rolls is .002 and .025 of an inch depending on the character of the lining material used and the desired thickness of the coating on the applying roll. The regulating roll 6 may also be rotatably supported in the brackets 4: and this roll is preferably arranged above the bath of the liquid lining material substantially as shown.

The regulating roll 6 and applying roll 5 are driven in the same rotational direction, but the regulating roll is driven in such a manner that its peripherahvelocity is considerably less than that of the applying roll, the speed of the regulating roll preferably being approximately one-third of that of the distributing roll in the illustrated embodiment in which the applying roll may be eight inches in diameter revolving at a speed of approximately fifty revolutions per minute and the regulating roll approximately two inches in diameter revolving at a speed of approximately fifteen revolutions per minute. By this arrangement liquid is permitted to flow back into tank 3 instead'of being carried around with roll 6 and deposited upon 'roll 5 above the horizontal plane of the axis of the rolls. For this purpose a pulley 7 is fixed to one end of the distributing roll 5 and a pulley 8 considerably larger than the pulley 7 is fixed to the regulating roll at the end opposite from the pulley 7. For conjointly driving the pulleys 7 and 8 a driving shaft 9 is supported in suitable brackets beneath the table 1 and pulleys 10 and 11 fixed to the shaft 9 are connected by belts 12 and 13 respectively to the pulleys 7 and 8. A drive pulley 14 also fixed to the shaft 9 may be connected to any suitable source of power, such as an electric motor concomitantly to rotate the rolls 5 and 6 in the same direction.

The principle of operation of the rolls 5 and 6 is diagrammatically illustrated in F igure 4 in which the arrows at and 12 indicate the directions of rotation of the respective rolls. Assuming that the bath of liquid lining material in the pan 3 is of relatively high viscosity and plasticity, a layer or stratum A of the material adheres to the surface of the applying roll 1 as it leaves the bath. Owing to the character of the lining material however a stratum B of material coheres to the stratum A of dominant adhesion, the stratum B being overbundant and excessive for the required purpose, The

relatively high peripheral velocity of the applying roll plus cohesion between the strata A and B causes the stratum B to be carried with the roll until substantially the point :10 is reached when the force of gravity considerable amount of the material toward the nip of the rolls where the regulating roll 6, the surface of which is rotating in a direction opposite from the juxtaposed surface of the applying roll overcomes the cohesion, strips the overabundant material from the roll 1 and forces this into the continuous web-like curtain or backflow C, the space between the rolls and relative surface velocity thereof being so chosen to maintain the backfiow or curtain C continuous and coextensive with the rolls. Although the greater por-v tion of the accumulated material from the stratum B at the nip of the rolls is returned in back flow to the bath, nevertheless a small 1 portion thereof may adhere to the regulating roll 6 forming thereon a stratum D which is carried around to the applying roll where it is added to the stratum A by cohesion, thus forming an effective coating E for applying purposes of a thickness approximately equal to the stratum A plus the stratum D.

The covers X which are shown in the form of circular disks havin upstanding peripheral flanges are rolled a ong the face of the applying roll 5 opposite from the regulating roll with their lower edge in contact with the roll and at a convenient angle so that as rolled progressively along the face of the roll the liquid lining material flows or is scraped on to the covers. For this purpose an endless cable 15 of rubber or other suitable material frictionally engages the covers X, passes around a sheave 16 fixed to a shaft 17 suitably supported on one end of the table 1, extends substantially parallel to the applying roll 5 over suitable guide sheaves 17 and a sheave 18 which are shown mounted on the opposite ends of the table 1. In order to maintain the cable 15 taut a weighted sheave 19'engages the cable beneath the table 1. For driving the cable 15 a sheave 20 is fixed to the shaft 17 and is connected by means of a belt 21 to a sheave fixed to the drive shaft 9, so that in this manner the applying roll 5, regulating roll 6 and endless cable or conveyor 15 are connected conjointly to be driven from Hill a single source of power applied to the edge resting upon a track 23 which extends parallel to and in close juxtaposition to the applying roll 5, and in contact with the applying roll so that as rolled along, the lining material is scraped on to the covers progressively until a ring of such material is formed thereon as discharged from the opposite end of the apparatus.

It has been found that the material applied to the roll 5 tends toward greater depth at the ends of the roll, probably due to surface tension, and to avoid this a scraper 24: may be associated with the distributor roll 6 in transverse alignment with each end of the applying roll. These scrapers preferably incline transversely with relation to the axis of roll 6 in which case their scraping ends are curved as shown in Fig. 5. In this way the material on roll 6 in the region of each end of roll 5 is deflected toward the adjacent end of roll 6, thereby preventing the coating on roll- 5 from acquiring excessive depth at the ends of roll 5. I

While one embodiment of the invention has been described in more or less detail to comply with the requirements of the statute, it is nevertheless desired that this detailed description be considered merely as illustrative and not as limited, and it is to be understood that changes and modifications may be made by those skilled in this art scribed, a trough for holding liquid adhesive. material, a rotating applying roll mounted to dip in said liquid, a regulatingroll parallel with, close to but spaced from, and driven in the same rotational direction as the applying roll, said regulating roll Whollyabove the liquid level in said trough.

2. In apparatus of the character described, a trough for holding liquid adhesive. material, a rotating applying roll mounted to dip in said liquid, a regulating roll parallel with, close to but spaced from, and driven in the same rotational direction as the applying roll, at surface speed less than that of the applying roll, said regulating 'roll wholly above the liquid level in said trough.

Signed by us at Cambridge, Mass, this 11th day of Februar 1925.

BRAD EY DEWEY. THEODORE T. MILLER. 

